Overall, these are winners
I love the scene; can't wait to see some zombies, country girls in Daisy Dukes, shotguns and so on and so forth
From technical angle, they look good, although I think you might get better rigging results if you watch your segmentation on the knee area a bit.
The big issue, though, is clothing with a mix of skin. Given that this doesn't look like a mass-army mod (or if there is a mass, it is not these guys) you might want to consider implementing the clothes as full costume sets, using the boots slot or even the gloves slot, covering a complete, near-naked body mesh. If you need a body mesh, I could probably arrange for the one I built awhile ago to be made available (finally); you'd have to unwrap and skin it yourself, but it'd give you a solid start (it's higher resolution than the TW one).
While this approach has some major disadvantages, it would allow for lots of different skin tones, which might beat out just having Redneck White Guys. If the Rednecks aren't super-numerous, it would be fine, from a performance perspective, and it would give a better result overall, because you could just swap clothing sets and everything else would get handled engine-side. It's a little harder to rig; clipping becomes more of a challenge.
Anyhow, that's just a thought; I can see the pros and cons of doing everybody as white guys to save a little time, but I think that in the end it'd probably be a better mod if you can see some skin on people with different skin tones and have it work well.
It'd also take care of the other major issue, which is that putting AO onto the pants means they won't look good with t-shirts, etc.; if you build tops and pants as separate items but bring them together via multi-mesh to build outfits, you can produce a bunch of outfits and then throw them on the bodies and do vertex AO on each assemblage, avoiding those issues.
The other option is to include racial variants for all the skin tones and build full-body outfits. That will get a little complicated to script but it's not hard on the art end. I'd just like to see people of all colors; even in Redneck Country, U.S.A. (where I live) there are quite a few people who aren't white, and the mod will probably have a broader appeal if everybody's represented.
It's a pity that skin tones only get sent to the bare body parts; if that uniform was sent to everything, it'd really make this kind of look easier to work with.